Recortador de Imágenes (PNG/JPEG/WebP, sin subida)

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• Los pasos y la copia se comprueban contra el comportamiento actual de la herramienta.
• Los limites del navegador, tamano de archivo o compatibilidad se documentan cuando importan.
• Salvo que se indique lo contrario, los archivos y textos se procesan localmente en el navegador.

Surviving Algorithmic Constraints

In 2026, uploading a raw, uncropped photo to a social media platform is a massive mistake. If you fail to adhere to their strict algorithmic aspect ratios, the platform's automated systems will violently crop your image, destroying your framing and tanking your visual engagement. Our Image Cropper puts the editorial control back in your hands before you upload.

Rigid Aspect Targeting

Stop guessing whether your avatar will fit nicely into a circle. We pre-loaded the engine with the exact dimensional constraints demanded by modern networks:

• 1:1 (The Square): Essential precision for LinkedIn profiles, Twitter avatars, and standard e-commerce product grids.
• 4:5 (The Portrait): The absolute maximum vertical real estate allowed on Instagram feeds. Crucial for maximizing mobile screen dominance.
• 16:9 (The Landscape): The undisputed standard for crisp YouTube thumbnails, Twitch overlays, and Substack hero banners.

Zero-Latency Local Frame Rendering

Cloud-based image editors are sluggish and force you to surrender your copyright by uploading unreleased marketing images to their servers. We inject the cropping mathematics directly into the HTML5 Canvas layer. When you fine-tune your rotation and click export, the browser locally slices the pixel data and drops a perfectly optimized .webp or .png to your disk instantly.

How to Crop a Photo to an Exact Aspect Ratio

Choose a preset, drag the frame over the part of the photo you want to keep, and export. The presets are free, 1:1, 4:5, 16:9 and 9:16, so the common social and print shapes are one click away. The zoom slider runs from 1x to 4x, rotation covers minus 180 to plus 180 degrees, and the quality slider, 0.92 by default, applies to JPEG and WebP output. PNG is available as well and is the only one of the three that keeps transparency.

The crop is taken at the source resolution rather than being upscaled, so the exported file is the crop area you selected, measured in the original pixels.

Worked example. Take a 4000 by 3000 pixel photo. With the 4:5 preset the frame is limited by the shorter side, so the crop is 2400 by 3000 pixels, because 3000 multiplied by 4 divided by 5 is 2400. Switch to 1:1 and the crop becomes 3000 by 3000. Switch to 16:9 and the width stays at 4000 while the height drops to 2250, since 4000 divided by 16 multiplied by 9 is 2250. The 9:16 preset is taller than it is wide, so the limiting side flips: the height stays at 3000 and the width becomes 1688 pixels, because 3000 multiplied by 9 divided by 16 is 1687.5 and the export rounds to the nearest pixel.

Rotation changes the shape of the export, so plan for it. When the frame is rotated, the exported image is the bounding box of the rotated crop rather than the upright rectangle, so it comes back slightly wider or taller than the frame suggests and the corners hold background. Pick PNG or WebP if those corners need to stay transparent, because the JPEG path fills them with white to avoid a black smear.

Two practical notes. Exporting at 0.92 is a sensible default for photographs, but moving the slider down to roughly 0.6 usually cuts the file size sharply with little visible damage on a photo, while a screenshot or a logo with flat colour and thin text is better exported as PNG, where JPEG ringing appears around sharp edges. And if the crop still has to hit a specific width afterwards, the image resizer takes it from there.

The guide to cropping images without uploading covers why a local page avoids the upload step entirely, and the cheat sheet for Instagram and Reel cover sizes lists the exact ratios those platforms expect.

Funciones clave

• Preajustes sociales: 1:1 para avatar, 4:5 para Instagram, 16:9 para miniaturas y 9:16 para Stories/Reels.
• Rotación y calidad: Ajusta rotación, zoom y calidad para equilibrar nitidez y tamaño.
• Sin subidas: Procesamiento por canvas en el navegador; tus fotos no salen del dispositivo.

Preguntas frecuentes

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